Moonstruck \Moon"struck`\ (m[=oo]n"str[u^]k`), a. 1. Mentally affected or deranged by the supposed influence of the moon; lunatic. [1913 Webster] 2. Produced by the supposed influence of the moon. "Moonstruck madness." --Milton. [1913 Webster] 3. Made sick by the supposed influence of the moon, as a human being; made unsuitable for food, as fishes, by such supposed influence. [1913 Webster]